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The Evolution of The  Atomic Theory
DemocritusLived: 460BC-370BCMain concepts: Everything is made of atoms Atoms are indivisible (cannot be  divided) Ato...
DaltonLived 1766-1844Main concepts: Each element has a different atom  and a different atomic weight All atoms of the ...
ThomsonLived: 1856-1940Main concepts:  Discovered that atoms ARE divisible  Discovered the electron through his   Cath...
RutherfordLived 1871-1937Discovered that there is a small, dense positively charged nucleusDiscovered that most of an a...
BohrLived 1885-1962Stated that electrons can only travel at specific distances from the nucleusStated that electrons ca...
ChadwickLived 1891-1974Discovered the previously unknown part of the nucleus of an atom- the Neutron!Named the neutron ...
Electron Cloud ModelThis is our most modern and accepted model of the atomIt differs from Bohr’s model because it states...
Time for:The atom song!http://www.youtube.com/wat     ch?v=vUzTQWn-wfE
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Evolution of atomic theory

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Evolution of atomic theory

  1. 1. The Evolution of The Atomic Theory
  2. 2. DemocritusLived: 460BC-370BCMain concepts: Everything is made of atoms Atoms are indivisible (cannot be divided) Atoms are small and solid particles Named the atom (called it “atomos”)
  3. 3. DaltonLived 1766-1844Main concepts: Each element has a different atom and a different atomic weight All atoms of the same element are perfectly identical Atoms cannot be created or destroyed in chemical reactions.
  4. 4. ThomsonLived: 1856-1940Main concepts: Discovered that atoms ARE divisible Discovered the electron through his Cathode-Ray experiment Atoms have a much larger mass than electrons Inferred that atoms have a positive charge Plum Pudding Model
  5. 5. RutherfordLived 1871-1937Discovered that there is a small, dense positively charged nucleusDiscovered that most of an atoms mass is in it’s nucleusPredicted the existence of neutronsStated that electrons move rapidly in the empty space around the nucleusConducted the gold foil experimentStated that atoms are mostly empty space.
  6. 6. BohrLived 1885-1962Stated that electrons can only travel at specific distances from the nucleusStated that electrons can jump between levels/paths around the nucleusStated that the chemical properties of an element are determined by how many electrons are in the outer shell.
  7. 7. ChadwickLived 1891-1974Discovered the previously unknown part of the nucleus of an atom- the Neutron!Named the neutron because of it’s lack of an electrical charge.His discovery made it possible to create new elements in the laboratory (heavier than Uranium) which was not possible before.
  8. 8. Electron Cloud ModelThis is our most modern and accepted model of the atomIt differs from Bohr’s model because it states that the electrons can be found in a general region around the nucleus, not specific paths.
  9. 9. Time for:The atom song!http://www.youtube.com/wat ch?v=vUzTQWn-wfE

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